Abstract: By embedding the watermarking with synchronous information frames in DCT domain and constructing a grid of difference feature points with fixed interval and fixed difference in space domain, a blind digital watermarking scheme against scaling attack was designed. The grid of difference feature points was defined, the embedding and extracting methods were given, and the algorithm for obtaining scaling factors was also presented. The experimental results show that the proposed scheme is robust to scaling attack.

Key words: digital watermarking, scaling attack, difference feature point, grid, suspicious grid point

摘要： 提出了一种抗缩放攻击的盲检测数字水印方案，在DCT域嵌入带有同步信息帧的水印信息,以及在空域构造具有固定间距、固定差分值的差分特征点网格是该方案的基本技术路线。给出了差分特征点网格的定义、嵌入和提取方法，提出了缩放系数的获取算法。实验结果表明，该数字水印系统对缩放攻击具有较好的鲁棒性。

关键词: 数字水印, 缩放攻击, 差分特征点, 网格, 疑似网格点